Generate sequence diagram

Skill Flexonze/claude-init/.claude/skills/generate-sequence-diagram

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npx -y skills add Flexonze/claude-init --skill generate-sequence-diagram

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Generate sequence diagram for a feature

SKILL.md

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Generate Sequence Diagram

Generate a simple Mermaid sequence diagram showing the flow of a feature: $ARGUMENTS

Instructions

1. Identify the Feature Flow

Search the codebase to understand how the feature works:

Find the entry point (API view, signal, management command, etc.)
Identify the key functions/methods called
Understand the order of operations
Note important interactions between components

Guidelines

Focus on the main happy path flow
Keep it simple - only show essential steps
Include key function calls and their purpose
Skip trivial operations (logging, validation unless critical)

2. Generate Mermaid Sequence Diagram

Follow these rules:

Use Mermaid sequence diagram syntax
Keep it SIMPLE - max 10-15 key steps
Show participants (actors, models, functions, external services)
Use clear, descriptive step descriptions
Group related operations in loops or alt blocks when helpful
Add notes to separate major phases

Example Output

sequenceDiagram
    autonumber

    Note over User,Storage: CREATING RESOURCE

    participant User
    participant API
    participant create_resource
    participant Storage

    User->>API: POST /resources/ with data
    API->>create_resource: create_resource(data)
    create_resource->>Storage: Save to database
    create_resource-->>API: Return resource
    API-->>User: Return 201 Created

    Note over User,Storage: PROCESSING RESOURCE

    participant process_task

    API->>process_task: process_resource.delay(resource_id)

    loop Each item
        process_task->>process_task: Process item
    end

    process_task->>Storage: Update status

3. Generate the Diagram Image

Create an SVG image: .claude/outputs/sequence-diagram-<feature-name>.svg (use kebab-case)
Create the .claude/outputs/ directory with a .gitkeep if it doesn't exist
Use SVG format for better scalability and readability

Steps

Pipe the Mermaid sequence diagram code directly to npx @mermaid-js/mermaid-cli using stdin:

mkdir -p .claude/outputs && touch .claude/outputs/.gitkeep && cat << 'EOF' | npx -y @mermaid-js/mermaid-cli -i - -o .claude/outputs/sequence-diagram-<feature-name>.svg
sequenceDiagram
    autonumber

    participant User
    participant API
    participant create_resource

    User->>API: POST /resources/
    API->>create_resource: create_resource(data)
    create_resource-->>API: resource
    API-->>User: 201 Created
EOF

Inform the user that the diagram has been created at .claude/outputs/sequence-diagram-<feature-name>.svg

Tips for Simple Diagrams

Combine multiple small steps into one meaningful step
Use descriptive names instead of technical details
Focus on WHAT happens, not HOW it happens internally
Use notes to separate major phases
Limit to 10-15 steps maximum
Group repetitive operations in loops